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Creating seamless transitions between two lofts
zach_morris
Member Posts: 25 ✭✭
I am trying to make a helmet and I thought it was done, but when I exported it into blender for texturizing I noticed that the two main lofts I made for the helmet are not joined smoothly and there's a crease. I think it may be related, but there's also a gap in the two halves of the helmet on one side after I mirror the model. I covered the top of the helmet with a mohawk so that part is not a big deal but I think it has something to do with why the lofts are not joining smoothly. I made the spline handles parallel on the curves I used as guides to make the lofts already, but they are not joining smoothly still.
I suspect there is some kind of start profile condition that will smooth it out, but I don't understand those and I tried a few times with no success. I've added a picture of the gap at the top of the helmet and also the seam at the crown of the helmet that creates a halo around the top of the head.
https://cad.onshape.com/documents/b2f8fe08679dabeeac1950da/w/17ab1e761096c9e8b822b024/e/0182e42400e098613859acbe
Best Answer
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MDesign
Member Posts: 543 ✭✭✭
Found it. Yes you need to set end profile condition to normal in Loft2 and in Loft1 set the 1st two guide profiles continuity to Normal
2
Answers
Without access to your doc, its hard to say what needs to be changed. but the easy answer is use delete faces on the cavern and it will probably clean it up. but if you need it with a lil flat like the other ribs you will need to do something different.
The link to the file might be important. XD I updated the post, but here's the link as well.
https://cad.onshape.com/documents/b2f8fe08679dabeeac1950da/w/17ab1e761096c9e8b822b024/e/0182e42400e098613859acbe
your file appears different than when you asked the question. so not sure if you still need feedback.
I was still trying to figure it out and had it rolled back to halfway through the file. I rolled it to the end though. If you suppress the sketch titled "mohawk" you can see the pictured issue with the top seem.
Found it. Yes you need to set end profile condition to normal in Loft2 and in Loft1 set the 1st two guide profiles continuity to Normal
If you still have issues getting the curvature of Loft to be continuous or having smooth transitions to other surfaces (Shift + C to check curvature of a surface), then you can use Boundary surface which is more controlled than loft. Remember, a surface is only as good as the curves you use to make it. Shift + C will also let you check the curvature of curves and sketch curves.
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Zebras are cool too.
Top one more fluid than bottom
This makes a lot of sense. I didn't realize that you could go into the guides and set their continuity. I think this should get me close enough for my purposes.
I'm primarily on iPad and never saw the curverature tool. I originally had the curves as a single spline, but to do the loft correctly in 2 pieces I had to split the splines.
I used the curverature tool as a constraint between the separate splines on my computer though on my profile and portrait sketches and now it states that my "Side Guide 5" does not intersect with Side Guide 5. I've gone into the profile sketch and the side guide sketch and made sure the points are all coincident though and they are. I'm assuming the redlines are the ones that are not showing as intersecting.
Any ideas there?
Sounds like you have the same curve defined as both a profile and a guide if it’s telling you it doesn’t intersect itself. Will look later to see if you don’t figure it out
This is your issue. that construction line is not 100mm down from the top plane like your sketch plane is for that curve.
Weird. I must have deleted that constraint on accident somehow. Now that I've put all this in place I'm unable to thicken the main body of the helmet and the crown of the helmet as one in "Thicken 2". When I do it as separate in "thicken 3" as a new extrusion there's a gap around the entire seem. Not sure how to get around that.
Thank you again for all of your help.
Turn Loft 2 into an add instead of new
Or change your continuity settings between those two surfaces
This makes a lot of sense why I couldn't extrude as one surface from this. I've been going in and checking the base sketches and surface continuity, and I'm not sure that I'll be able to get rid of the seam. I think I may start again from scratch and maybe use the boundary tool to do the surface instead.
I don't think you don't need to start over unless you enjoy doing so. haha. But it will give you a much more robust understanding going forward.